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Old 04-07-2007, 11:41 AM   #1
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Roof Rail drag

Have anyone seen any figures on how much the roof rails without the rack add to CD value?

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Old 04-07-2007, 03:21 PM   #2
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I would think it depends on the vehicle. Some one ran a test on the Jetta wagon and found taking the rails off actually increased the CD. They are quite low to the roof though; they must somehow smooth out the airflow.
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